They found the cancer cells of mother and baby carried the identical mutated cancer gene (called BCR-ABL1), but the infant had not inherited this gene.

他们发现母亲和婴儿的癌细胞携带有相同的突变癌基因（被称为BCR-ABL1），但是婴儿并没有得到这种基因的遗传。

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The research shows that the protein produced by BCR-ABL1 is necessary to trigger and maintain the cancer, the scientists said.

BBC: Leukaemia 'on-off switch' discovered